The mixed martial arts expert's partially decomposed remains were found by a couple hiking in the area. A helicopter was sent to recover the body, Inyo County officials confirmed.
'It appears that Legeno died of heat-related issues, but the Inyo County Coroner will determine the final cause of death," said a sheriff's department spokesman.
County Deputy Coroner Jason Molinar said the former bouncer and wrestler's body may have been lying for days in triple-digit heat.
Watson, who became a world-wide star thanks to her role as Hermione Granger in the Harry Potter franchise, expressed her condolences via Twitter.
I'm so sad to hear about #DaveLegeno. He was such a lovely man. I hope he is resting in peace x
— Emma Watson (@EmWatson) July 12, 2014
— HollywoodTake (@HollywoodTake_) July 11, 2014
The caption accompanying the photo read:
"Dave Legeno. It was always a pleasure. He was a great talent with a heart of gold and always had time for anyone. Dave was a soft, kind gentleman off screen but had the skill to be the complete opposite on screen. He taught me lots, You will be missed mate xx #DaveLegeno."
Legeno, who also starred in Guy Ritchie's Snatch, is survived by a 20-year-old daughter, Wendy.
Image via YouTube